Automatic valve for gas-burners



(No Model.)

A. M.- MxTGHEL-L. kA'I'OMATI VALVE PUB GS BURNBRS.

No. 545,302. alselrltedAug. 27, 1,895.

Uriireo- Sienne ?efinhifr SPECIFICATION forming part of Letters Eetens No. 545,302, siete-.d August, 1895. Application filed Merch 30, 1895. Serial No. 55g729 (No inodel.)

.To all whom z may concern:

Be it known that I, ARDoN M. MITCHELL, a. citizen of the United States, residing in the city of Brooklyn, county of Kings, end State Vof New York, have invented certain new end useful-Improvements in Automatic Valves for Gesdurners, of `which the following is ziA deseription.

M y invention consists of certain novel perte end combinations ot parte, all of which Will he speciiieally pointed out in the claims conclnding this specification. In the accompanying drawings, Figures 1 and 2 erevei'tieel sections through 2. burner having my improved automatic valve epplied thereto, showing the same in different pesi tiene; and Fig. 3 is e, horizontal section through the burner and valve shown in Fie. 1 on the line 3 3.

Similar iignres of reference indicate the same or corresponding parte of all the tignres.

The following` is e description ot' the strnetnre shown in the accompanying drawings, which deeoription will enable persons skilled in the art to practice my invention in the form nl; present preferred hy me; but it Will hennderstood that my invention is not lim- `ited to the precise forms shown, as various modifications, some of which will be indicated in the course of the description, may he adopted without departing from. the Spirit of my invention zuid without exceeding the scope of the concluding claims.

Referring to said drawings, 10 is,A the tubular part of en ordinary gaehur'nein 1l is a tip oi: ordinary forni.

12 is a sci'ew-threed, by ineens of which the burner is attached to the gas-pipe.

13 is n perforated pillar, through which the gas hows to the tip 11, which' is supported at the upper end thereof.

14.1 isa port in the pillar 13,. 16 is evelve controlling said port. This valve is composed of or supported by n strip composed ot materiels having dierent coeiiieients of expansion placed side by side' and attached together. This strip 16 is attached at 17 to the eniarged port 0E the piller 13. The lower end of the strip lil-that pari; forming the velvewis prog vided with e packing 18.

heet of the ineinh 19 is e, piece ot' asbestos or other nonnenducting materiel.

The principle on i l may 'be time deecri vali-fe operates Application. ci heetes, for exampld'oy :in ordinary niet/3h applied in the usuel manner to lig;u te. of gesum @enses the valve 1d to lifted from its sent end time te open ihe port, 14., so that, gee een flow thereihrongh "te lhe tip. The port remeine open. ne lo s 1" :t i applied. The.

e the opening;

metter inniotion o the vim creefied oi' continued flame.

The valve ite siste of the combine oi ingdiierentcoeflioieh lient ie applied to e etre *Lowell-known lewe, the etriicinre es a whole or parte thereof nre letereliydeeoted, which lateral deiioction opens the port l-i. Th. metals or materiels niej; he united in any suitable wey, es oy deposition or 'hy solder.l ing or by the preeert tinii fer to moire the val ve oi thereof of dierent ino relative coeiiioicnts of exp( .eine le; externn ple, of the combination of i or and zinc or of platinum and eine. lhey might, however, be made iu whole in. perl; of

materials not metallic, and, es en, exemple,

coefficient 'of het'oondnotivity, es therebyl the heet applied to the tip is more readily conducted to the operating peri of the stem;

but this is not essentiel.

The piller 13 may he made of nny suitable materiel. I prefer, however, to ineke it of e material having e.- high coefficient of conductivity-euch, for enemolei es copper-mend nel s ceases to extend it up as near as may ce to the tip, so that the heat of a match applied in the ordinary manner to the tip will be readily conducted toand through the pillar to operate the valve.-V valve itself might he relied upon to conduct the heat to its operating part, but the action woluld be less prompt.

I prefer to apply to the valve a packing l5 of some material which readily conforms to the surface against which it is pressed, and which is not affected iujuriously by the heat present. Many different materials might he used, but at present l prefer to use a laminated packing consisting, for example, of sheets ot thin aluminiumfoil or silvcrioil. There are some advantages in making it of silver-toil, in that the conductivity ot' silver is high, and hence the heat from the pillar `will be 'more readily communicated to those rparts of the valve covered bythe packing, which is desirable, especially when the entire strip 1G is made of materials having,r dilerent coefficients olf expansion.

instead ot the valve bein g arranged to close `its port with its face, as it does in the structure shown in the drawings, it might be ar-I ranged to open and close the part by the lateral motion of its end.

The device may be operated in the ordinary Way.

The lighted match applied to the tip or to any part otk the tube supporting the tip will. causo the valve, doe to then'unequal expan-Y sionvot its parts, to have a'lateral motion, which will. uncover the port lei. and permit gas to issue from the tip. This zas being; ig nited may produce only a small llame; but the heat of this flame will continue the motion of the valve and a flame of the full dimensions will soon be produced; or, it' prefel-red, the valve may be opened positively by any suitabley mechanism controlled from the outside of the burner to start the flame. lf the gas be extinguished Without turning the cock, as by blowing it out, the burner will gradually cool and the valve will seat itself until the port ifi is Woll covered and the pa ge of the gas thereafter suspended.

it is obvious that the extent to which the valve uncovers its port is determined by the amount ot heat present, and that this is in -turn dependent upon the amount of gas pass ing through the burner in a given periodof time, since the more rapidly the passage o gas the more caloric will be carried ,away by it. lt is therefore plain that in case of irregular supply the accelerated passage of gas may he made to automatically cause the valve to seat itself a. proportionate amount, thus cutting,y oli an abnormal supply and regulating the amount of gas consumed. lt is obviousthat the :n ore rapid passage of gas through the parte will diminish their temperature and that this in turn will diminish the lateral motion et; the valve and lieues diminish the.

Of course the material of the' port through which the gas can pass, and that ou the other hand a diminished ow of gas will, by carrying,r awayless caloric, result in ay higher temperature of the parts and a larger porthrea, and hence an increased flow t pas.

nother advantageous feature is that the gas is heated before itissues from the burner, due partly lto the heatedtvalve itself project ing down into the tip and partly to the heated pillar containing the port.y It is well understood that.' the heating ol' gas before it issues from the burner increases the brilliancy of the llame and the economy of consumption.

For some reasons l prefer to makethe tube 10 of non-conducting material, as thereby less heat applied' bythe match will he dissipated and lost; but at present I make it of a oonducting material and preferably economize heat by interposing between the tip and the tube a non-conducting material lill-such, for example, as asbestos.

I prefer to make the valve 1G or its stem of an elastic or springing material, as the cias licity of the material may then be relied upon to keep or aid in keeping the valve firmly seated.

The' device above described may be used with or without the ordinary stop-cock on the gas-supply pipe. My present intention is -to use it with the stop-cock, whereby the height of the flame may be regulated in the ordinary manner, although it might be used without such etcp-cock.

In tlidforegoing specification I have rcferred to various moditications which might he adopted in the practice o' my invention,

out I have not endeavored to specify all the modifications which might be made; and it will he understood that reference by me to some of these is not intended to exclude others not referred to but which are within the spiritand scope of my invention, broadly considered.

In the Concludi-n rclaims the omission of an element or the omission of reference to the detail features of the elements mentioned is intended to be a formal-declaration of the fact. that the omitted elements or features are'not essential to the inventions therein severally covered.

1. in va ges burner, the combination with the tip and burner tube, et' a port, a valve automatically operated by a device composed of materials having different coeilicicnts of expansion, a perforated. pillar composed. oi' heat conducting material containing said port and about insulating material between said pillar and said tube. 4

2. A packing composed of a plurality of layers of metallic foil in Contact with`V each other Wrapped upon a support.

3. in a gas burner, the combination with a port, a valve automatically operated by variations of' temperature and a packing comn BOO IIO

posed of puffdy Gil' layers of iglmllc .'o in Contact wtn each other Wrapped upon a .support In :L gils immer, th@ combina-Mun with port, of vave moving' in z2. dgonzo curved Hna with 'frrezme 1:0 said' pori: mzmmcaly @gaming and dosing said port and varyig iis: sze npmpnrtma to the bmi present by tha sxgansicn mal contmion of the device aomposd Gf materials havngdfm ferent co-ecents of epanon.

ARDQN M. ENTCHELL. Witnesses:

M. RWLSGN,

J. EDGAR BULL. 

